Laserfiche WebLink
c <br /> i SU" ' �a <br /> L J <br /> UM <br /> FEB I 9 2008 <br /> ENVIRONMENT HEALTH <br /> February 13, 2008 PER!VIIT,!SERVICES <br /> San Joaquin County Environmental Health Department <br /> LOP/Site Mitigation Unit 1V <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Attention: Mr. Frank Girardi <br /> Re: Revised Addendum to <br /> Revised Draft Work Plan and <br /> Preliminary Site Hydrogeologic Conceptual Mod 1 <br /> Additional 1,2-DCA Investigation <br /> RWQCB Case No. SLT5S033 <br /> Local Agency Case No. 1882 <br /> Former American Forest Products Facility <br /> 2801 West Lane <br /> Stockton, California <br /> URS Project No. 17322736 <br /> Dear Mr. Girardi: <br /> Introduction <br /> On behalf of Mr. William Bergvall, consultant for American Forest Products Company LP, URS <br /> Corporation Americas (URS) is submitting this work planaddendum to the above-referenced work plan <br /> previously submitted October 22, 2007. This revised a dendum has been prepared in response to <br /> comments on the work pian received from the San Joaquiin County Environmental Health Department <br /> (SJCEHD) in your letter dated December 3, 2007, and cc cats on our addendum dated January 11, <br /> 2008, received in a telephone conversation with Mr. Nuel He derson on February 9, 2008. <br /> Summary of October 200 Work Plan <br /> This work plan summarized data gaps in the definition of A1 plume of 1,2-DCA emanating from a former <br /> waste oil underground storage tank (UST) at the east end of a former maintenance shop. Data gaps in the <br /> lateral definition of the plume were found to exist downgradient to the north, and laterally to the east and <br /> southwest. This plume was identified by groundwater sam 3le data from wells screened generally in the <br /> range of 60 to 70 feet below ground surface (bgs). The wor c plan asserted that data from monitoring well <br /> DMW-8, with a screen interval of 80 to 90 feet bgs, indicated that the distribution of 1,2-DCA was <br /> limited to the shallower groundwater at the site. This was b�sed on the fact that this well is located in the <br /> area of the highest shallow concentrations of 1,2-DCA(see Figure 1). <br /> URS Corporation <br /> 2870 Gateway Oaks Drive,Suite 300 <br /> Sacramento,CA 95833 <br /> Tel:916.679.2200 <br /> Fax:916.679.2900 <br />